Grinding machine



Sept. 25, 1934. o, A, SWANSON GRINDING MACHINE Filed Jan. 2, 1930 4Sheets-Sheet l 92 fiat 2a.

R. S. m H m M OVV m a M A vi a. n M 7 Q Y. 0 a: B 7 9 o 7 M; a A! %%%9%Se t. 25, 1934. o. A. SWANSON 1,974,696

GRINDING MACHINE Filed Jan. 2, 1930 4 Sheets-Sheet 2 INVENTOR.

BY wgfM/ A TTORNEYS.

Sept. 25, 1934.

O. A. SWANSON GRINDING MACHINE Filed Jan. 2, 1930 4 Sheets-Sheet 5 INVEN TOR.

ATTORNEYS.

Sept. 25, 1934. o. A. SWANSON GRINDING MACHINE Filed Jan. 2, 1930 4Sheets-Sheet 4 LLAN VENTOR. L d/cam WVLQKM/ I A TTORNEYS.

Patented Sept. 25, v1934 PATENT OFFICE GRINDING MACHINE Oscar A.Swanson, Erie, Pa.

Application January 2,

19 Claims.

In grinding round articles, difficulty is experienced in properlypresenting the work to the grinding wheel. Such articles are usuallyrotated by engaging the ends of the article so as to rotate the workpresenting the annular surface to be ground. 1 The engagement anddisengagement of such driving mechanism takes time and complicates themechanism. This is particularly true with relation to mechanisms whichautomatically deliver and discharge the work. It also presentsdifficulties with relation to such devices, as wringer rolls, in whichit is desirable to grind the entire rubber surface centered on a metalshaft to which the rubber is attached and in the present example of theinvention and which has the preferred embodiment the apparatus is sodesigned as to automatically receive, grind and discharge wringer rolls.In carrying out the invention the mechanism is very much simplified bydriving the work, in this instance the wringer roll, by frictionallyengaging the surface of the roll itself, preferably directly oppositethe point of engagement with the grinding wheel. This avoids thenecessity of chucks and gripping mechanism engaging and disengaging theextending shafts together with the requisite rotative driving mechanismfor such engaging mechanism. Features and details of the invention willappear from the specification and claims.

A preferred embodiment of the invention is illustrated in theaccompanying drawingsas follows:

Fig. 1 shows a side of the device.

Fig. -2 a section on the line 2-'-2 in Fig. 1.

Fig. 2a an elevation of the mechanism show in Fig. 1.

Fig. 3 a section on the line 3-3 in Fig. 1.

Fig. 4 a section on the line 4-4 in Fig, 1.

Fig. 5 a development of the cam advancing and retracting the grindingwheel.

Fig. 6 a section on the'line 6-6 in Fig. 3.

Fig. 7 a-sectiori on the line '7--'7 in Fig. 3.

Fig. 8 a side elevation of the driving mechanism for the driving roll.

Fig. 9 a section on the line 9=--9 in Fig. 1.

Fig. 10 an enlarged view of one of the carriers.

.1 marks a machine frame which is carried by a base 2. A grinding wheel3 is mounted on a shaft 4 and the shaft 4 is journaled in bearings 5 onthe frame of the machine. It is driven by a pulley 6 from any convenientsource of power. The journals 5 are carried on a frame 7 and this framehas a base 8 with an undercut groove 9 slidingly engaging dove-tailedshoulders 10 of a sliding support 11. The sliding support likewise hasan 1930, Serial No. 418,073

undercut groove 12 slidingly mounted on a dovetailed shoulder 13 on theframe. A base 8 may be adjusted on the sliding support by means of ascrew 14 and locked in adjustment by screws 15. The grinding wheel iscarried by and retracted from the work by the following mechanism: A camroller 16 is secured on the underside of the sliding support andoperates in a cam groove 1'7. The cam groove is formed in a wheel 18fixed on a shaft 19. The shaft 19 is journaled in bearings 20 on theframe. It is driven through a spiral gear 21 from a spiral gear 22. Thespiral gear 22 is fixed on a shaft 23. The shaft 23 is journaled inbearings 24 on the frame. A sprocket wheel 25 is fixed on the shaft 23and is connected by a ehain'26 with a sprocket wheel 27. The sprocketwheel 2'7 is fixed on a shaft 28. The shaft 28 is journaled in bearings29 on the frame and is driven through a pulley 30 receiving its powerfrom any convenient source. The cam groove 17 is developed in a drawingshown in Fig. 5. It simply advances the wheel to the grinding positionand holds it there through the greater part of the cycle and thenretracts it to.a definitedistance holding it retracted for a slightperiod and then advancing the wheel. It is also desirable to reciprocatethe grinding wheel slightly axially in order to assure a uniform surfaceon the work. This is accomplished in the present mechanism as follows:Asprocket wheel 31 is fixed on the shaft 19. A chain 32 extends from thissprocket wheel to a sprocket wheel 33. The sprocket 33 is fixed on ashaft 34. The shaft 34 is journaled in brackets 35 extending from theframe. A cam wheel 86 is fixed on the shaft 34 and is provided with a'cam slot 37 A cam wheel 38 extends into'the slot and the cam wheel iscarried by a rock arm 39. The rock arm is carried by a shaft 40journaled in a bracket 41 extending from the frame. The rock arm 39 hasa fork 42 at its upper end with rollers 43 in each arm of the fork,which rollers engage ball bearing shoulders 44. In this way the grindingwheel is given the necessary axial movement to assure uniform grinding.The work -is received and presented to the grinding wheel by anautomaticallyactuated carrier which is arranged as follows: Carrierdiscs 45 are mounted on a shaft 46, which shaft is journaled in bearings46a on the frame. The discs are made up of the side plates 47 having anintervening spacer plate 47a. The discs have slots 48 adapted to receivewringer roll shafts 49a of wringer rolls 49. These slots have rollers 50and 51 which are journaled on pins 50a and 51a extending between theplates. A movable roller 52 is mounted on an arm 53. The arm 53 ismounted on a rock shaft 54 journaled in the disc, the arm being arrangedbetween the discs. An arm 55 is secured to the rock shaft 54 at theouter face of the disc. The rock arm has a cam roller 56 which rides acam 57. The cam 5'7 has a depression 58 which permits the rock arm toswing forward and bring the roller 52 into engagement with a roll shaft,as clearly shown at the left of Fig. 6. A spring 59 swings the arm 53when the roller reaches the depression 58. In order to give rigidity,however, to the rollers 52 and consequently to the bearing formed by therollers 50, 51 and 52 carrying the wringer shaft the arm 53 ispositively locked when the roller reaches the grinding position. Theroller 56 moves against a lip 60 on a plate 61, the plate 61 beingsecured to the cam 5'7. The lip positively holds the roller inengagement with the cam surface in the depression 58 and thus holds therollers in a fixed position during the grinding operation. The arm 53 asit is advanced passes out from under the lip 60 and reaches the end ofthe depression where a cam surface 62 moves the arm 53 so as to swingthe roller 52 clear of the wringer roll shaft so as to discharge thewringer roll. A driving roll 63, preferably formed of rubber, engagesthe wringer roll at a point preferably directly opposite the point ofengagement of the grindingwheel. The driving roll 63 is mounted on ashaft 64 journaled in bearings 65 on brackets 66 extending from a plate6'7. The plate 6'7 has an undercut groove 68 slidingly engagingdove-tailed shoulders 69 on the frame. The plate 6'7 has slots '70through which locking screws '71 extend. Screws '72 extend through aplate '73 secured on the plate 67. The screws 72 permit of a niceadjustment of the plate 6'7. A spring '74 operates on the plate '73 andtends to force it forward against the action of the screw 72. A drivingwheel '75 is fixed on the shaft 64 and is driven by a belt '76 from apulley '77. The pulley '77 is fixed on a shaft 78 and the shaft '78 isjournaled in bearings 79 mounted on the plate 6'7. A pulley 80 is alsofixed on the shaft and is driven from any convenient source of power,thus delivering the necessary action to the driving roll 63.

It will be noted that the roller 63 is slightly shorter than the roll.It ordinarily would be as short as the shortest roll and one of thecarriers, the one at the right in Fig. 3, is adjusted axially on theshaft 46 so as to adjust it to different lengths of wringer rolls. Thecam 57 at that side of the machine is also adjustable with the carrierand is locked in adjustment and against turning by a pin 81 whichextends through the frame and is locked in adjustment by a set screw 82extending through a boss 83 on the the grinding position the followingmechanism is provided: It comprises what is ordinarily termed a Genevamovement and has. the driven wheel 84 with a series of slots 85corresponding in number to the slots 4'7 on the carrier. This drivenwheel. also has concave locking surfaces 86. A roller 8'7 is mounted ona drive wheel 88 and enters a slot 85 with each rotation of the wheel88, advancing the wheel 84 the distance between the slots, thus bringinga new roller in a slot 48 to the grinding position. The wheel 88 has thecurved projections 88a engaging the concave surfaces 86 0f the wheel 84,thus locking the wheel 84 through the intermediate travel of the wheel88,

the curve 88a being broken at 88?) to permit the forward movement of thewheel 84. A positive lock or positioning device is also provided for thewheel 84. The ends of the slots 85 are flared at 89 and a latch 90having a beveled end 91 is moved forward into the slot locking it ineach successive position. The latch operates in a guide 92 carried by aplate 92a secured to the side of the frame. It has an extension 93 whichprojects into a pocket 94. A spring 95 operates against the end of theextension and is seated on a plug 96 in the end of the pocket. Thespring yieldingly forces the latch forward into locking position. Thelatch has a notch 97 which is engaged by a rock arm 97a. The rock arm ismounted on a pin 98 extending from the plate 92a. The opposite end ofthe rock arm is provided with a roller 99 which rides a cam surface 100on the wheel 88. This cam surface has a lift portion 101 and when thelift portion engages the roller 99 the latch is retracted so as topermit of the movement of the wheel 84 and with it the work carrier. Itwill be noted that the latch 90 does not extend out to the outer face ofthe wheel 84, thus allowing clearance for the wheel 88 past the latch90.

The wringer rolls are fed to the carrier from a magazine. This ismounted on a frame projection 102. The magazine is formed of spacedrails 103 at one side of the machine and secured to the upright 102 by abracket 104. At the opposite side of the machine guide supports 105 aresecured to the upright 102 and rails 106 similar to the rails 103 areadjustably secured to the guide supports by adjustable plates 107. Thusthe guide supports at this side. of the machine may be adjusted inwardlyand outwardly to accommodate different lengths of rolls. The rolls areinserted at the end of the inclined guide plates, as clearly indicatedin Fig. l and pass down by gravity. As a roll is carried out from underthe guides by the advance of the carrier the peripheral surface of thecarrier supports the next succeeding roll until a new slot 48 is broughtunder the roll thus supported when this roll drops into the slot in thecarrier and in this position supports the other rolls above it. It willbe understood that the guide preferably terminates directly above theposition assumed by a slot 48 just at the next stop preceding thegrinding position. A series of rollers 108 are mounted in plates 109.The plates 109 have a slight inclination so that when the wringer rollsdrop upon them as discharged from the carrier they roll out at the sideof the machine and are thus ultimately discharged.

It will thus be seen that in this machine the rolls are simply placed inthe magazine, are received one by one by the carrier, are automaticallyadvanced by the carrier to the grinding position, are driven through thedirect frictional engagement of the roll by a driving roll and are atthe same time engaged and ground by a grinding wheel which isautomatically advanced and retracted as each roll is presented 1 to it,and that the rolls at the completion of the grinding operation aredischarged from the carrier and carried out of the machine; that thecarrier can, under these circumstances be made of a very simple form,merely providing means for receiving and journaling the wringer rollshafts; that no automatic driving chucks, or gripping mechanisms onthese shafts are required as the rotative movement of the roll isaccomplished through the direct gagement on the roll itself.

It will be noted that .the driving wheel 63 has such engagement with theroller being ground that it retains the wringer roll as against theendwise thrust incident to the reciprocation of the grinding wheel.

What is claimed as new is:--

1. In a grinding machine, the combination of a grinding wheel; a pair ofwork supports, each having a plurality of rollers one of which ismovable to receive the work; means automtically moving the movable rollto open and close the support; and a work driver rotating the work byfrictional engagement with the work surface.

2. In a grinding machine, the combination of a grinding wheel; a carrierhaving a plurality of work supports, each work support comprising aplurality of rollers; one of which is movable; means for advancing thecarrier to bring the supports successively to grinding relation; meansfor moving the movable support to open and close frictional en- .thesupport for receiving and discharging the work; and a work driverrotating the work by frictional engagement with the work surface.

, 3. In a grinding machine, the combination of a grinding wheel; a worksupport in which the work is rotatably mounted on an axis fixedrelatively to the support and held in grinding relation to the wheel,said wheel having a length equal to the length of the work; means forreciprocating the wheel axially; and a work driver rotating the work byfrictional engagement with the work surface subjected to the grindingaction.

4. In a grinding machine, the combination of a grinding wheel; worksupports, each having a series of rolls, one of which is movable, andadapted to engage the metal shaft of a rubber roll to support the samein grinding relation with the wheel; and a driver rotating the work byfrictional engagement with the surface.

5. In a grinding machine, the combination of a grinding wheel; a carrierhaving a plurality of supports, each support comprising a plurality ofrolls, one of which is movable, said supports being adapted to engagethe metal shaft of a rubber roll and hold the same rotatably in grindingrelation with the wheel; means for advancing the carrier to advance thework into grinding 150i relation; means operating frictionally on thework surface for rotating the work on its axis; and means moving themovable roll to receive and discharge a roll.

6. In a grinding machine, the combination of a grinding wheel; a worksupport in which the work is rotatably mounted and held in grindingrelation with the wheel; means for opening and closing the support, saidsupport being adapted to support a wringer roll by engagement with thewringer roll shaft; means driving an inserted wringer roll rotatively onits axis by frictional engagement with the work surface; a magazine Aholding a plurality of wringer rolls; and means for automaticallyopening and closing the support to receive rolls from the magazine anddischarge the same from the support.

'7. In a grinding machine, the combination of ,a grinding wheel; a worksupport in which the work is rotatably mounted and held in grinding,

relation with the wheel; means for opening and closing the support, saidsupport being adapted to support a wringer roll by engagement with thewringer roll shaft; means driving an inserted wringer roll rotatively onits axis by frictional engagement with the work surface; a magazineholding a plurality of wringer rolls; means for automatically openingand closing the support to receive rolls from the magazine and dischargethe same from the support; and means for conveying the rolls from themachine.

8. In a grinding machine, the combination of a grinding wheel; a worksupport in which the work is rotatively mounted at both ends andpositively secured by engagement of parts separated from the surfaces tobe ground on an axis fixed relatively to the support and held ingrinding relation to the wheel; a rotating friction wheel rotating theWork by frictionally engaging the work surface; and means automaticallydelivering the work to the support.

9. In a grinding machine, the combination of agrinding wheel; a worksupport in which the work is rotatively mounted at both ends andpositively secured by engagement of exterior surfaces of parts of thework separated from the surfaces to be ground on an axis fixedrelatively to the support and held in grinding relation to the wheel; arotating friction wheel rotating the work by frictionally engaging thework surface; and means discharging the work therefrom.

10. In a grinding machine, the combination of a grinding wheel; a worksupport in which the work is rotatively mounted at both ends andpositively secured by engagement of parts separated from the surfaces tobe ground on an axis fixed relatively to the support and held ingrinding relation to the wheel; a rotating friction wheel rotating thework by frictionally engaging the work surface; means automaticallydelivering the work to the support; and means discharging the worktherefrom.

11. In a grinding machine, the combination of a grinding wheel; acarrier having a plurality of work supports in which the work isrotatively mounted at both ends and positively secured by engagement ofexterior surfaces of parts of the work separated from the surfaces to beground and on which the work is rotatively mounted on an axis fixedrelatively to the support; means acting on the carrier advancing thesupports to and retarding them at the grinding position with relation tothe wheel; and a rotating work driver rotating the work by frictionalengagement with the work surface subjected to grinding.

12. In a grinding machine, the combination of l a grinding wheel; acarrier having a plurality of work supports in which the work isrotatively mounted at both ends and positively secured by engagement ofparts separated from the surfaces to be ground and on which the work isrotatively mounted on an axis fixed relatively to the support; meansacting on the carrier advancing the supports to and retarding them atthe grinding position with relation to the wheel; a rotating work driverrotating the work by frictional engagement with the work surfacesubjected to grinding; and means automatically delivering the work tothe supports.

13. In a grinding machine, the combination of a grinding wheel; acarrier having a plurality of work supports in which the work isrotatively mounted at both ends and positively secured by engagement ofparts separated from the surfaces to be ground and on which the work isrotatively mounted on an axis fixed relatively to the support; meansacting on the carrier advancing the supports to and retarding them atthe grinding position with relation to the wheel; a rotating work driverrotating the work by frictional engagement with the work surfacesubjected to grinding; and means automatically delivering anddischarging the work from the supports.

14. In a grinding machine, the combination of a grinding wheel; acarrier; work supports on the carrier arranged in pairs, said supportsbeing separated and adapted to rotatively and positively secure the workat both ends by engagement of parts separated from the surfaces to beground on an axis fixed with relation to the carrier; means foradvancing the carrier to bring the supports successively into, andretarding them at, the grinding position with relation to the wheel; anda driverarranged between the supports rotating the work on its axis byfrictional engagement with the work surface operated upon by thegrinding wheel.

15, In a grinding machine, the combination of a grinding wheel; acarrier having a pair of separated discs; work supports arranged on saiddiscs in pairs, said supports being separated and adapted to rotativelyand positively secure the work at both ends by engagement of partsseparated from the surfaces to be ground on an axis fixed with relationto the carrier; means for advancing the carrier to bring the supportssuccessively into, and retarding them at, the grinding position withrelation to the wheel; and a driver arranged between the discs rotatingthe work on its axis by frictional engagement with the work surfaceoperated upon by the grinding wheel.

16. In a grinding machine, the combination of a grinding wheel; a worksupport adapted to secure a rubber roll having an extending shaft ateach end by engagement with the peripheral surface of the shaft and tomaintain the axis of the shaft concentric with the axis of rotation andto present the rubber portion into grinding relation with the wheel; anda rotative work driver having its axis off-set from the axis of acre-seethe work support rotating the work by frictional engagement with theroll.

17. In a grinding machine, the combination of a grinding wheel; asupport carrier; a plurality of supports on the carrier adapted tosupport rolls having extending shafts with their axes fixed relativelyto the carrier by engagement of the support with the peripheral surfacesof the shafts and adapted to maintain the axes of the shafts concentricwith the axes of rotation; means for advancing the carrier to advancethe rolls into grinding relation with the wheel; and rotative meansoff-set from the axis of the supports for driving the rolls byfrictional engagement with the roll surfaces.

18. In a grinding machine, the combination of a grinding wheel; acarrier comprising a pair of discs; supports on the discs adapted to receive and support rubber rolls having extending shafts having their axesoff-set relatively to each other and fixed relatively to the carrier andto maintain the axes of the shafts concentric with the axes of rotationby engagement with the peripheral surfaces of the shafts; means foractuating the carrier to advance the rolls into grinding relation withthe wheel; and a rotating driver having its axis off-set from the axesof the supports rotating the rolls by frictional engagement with thework.

19. In a grinding machine, the combination of a grinding'wheel; a Worksupport adapted to secure a plurality of rubber rolls having extendingshafts and to maintain the axes of the shafts concentric with the axesof rotation by engagement with the peripheral surfaces of said shaftsand to present them successively into grinding relation with the wheel;and a driving roll acting frictionally against the rubber roll forrotating the rubber roll.

OSCAR A. SWANSON.

